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首页> 外文期刊>Physical chemistry chemical physics: PCCP >Effect and role of alkali metals added to cobalt ion-exchanged X and Y zeolite catalysts in the gas-phase catalytic oxidation of benzyl alcohol
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Effect and role of alkali metals added to cobalt ion-exchanged X and Y zeolite catalysts in the gas-phase catalytic oxidation of benzyl alcohol

机译：钴离子交换的X和Y沸石催化剂中添加碱金属在苯甲醇气相催化氧化中的作用和作用

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摘要

The effect and the role of the alkali metals added to cobalt ion-exchanged NaX and NaY type zeolties (Co-NaX, Co-NaY) on catalytic activity in the gas-phase catalytic oxidation of benzyl alcohol were studied under various reaction conditions. The alkali metals, impregnated into the Co-NaX and the Co-NaY zeolites, promoted catalytic activity in the partial oxidation measured by the yield of benzaldehyde obtained. The amount of added alkali metal under a constant amount of the ion-exchanged cobalt had an optimal value for the catalytic activity in the partial oxidation. The amount of O-2 uptake of the alkali metal/Co-NaX and -NaY zeolites pre-reduced by carbon monoxide was higher than that in their alkali-free counterparts. The catalytic activity in the partial oxidation was correlated with the amount of O-2 uptake of the alkali metal/Co-NaX and -NaY zeolites. The comparison between the diffuse reflectance spectra of the Co-NaY catalysts, both with and without added alkali metal, clearly showed that the alkali metal added to the Co-NaY made the oxygen affinity of ion-exchanged Co species more effective and the formation of the cobalt oxides (Co3O4) easier; the cobalt oxides were suggested to be responsible for the partial oxidation of benzyl alcohol. [References: 32]
机译：研究了在各种反应条件下，钴离子交换NaX和NaY型沸石（Co-NaX，Co-NaY）中添加碱金属对苯甲醇气相催化氧化催化活性的影响和作用。浸渍到Co-NaX和Co-NaY沸石中的碱金属在部分氧化中促进了催化活性，这是通过获得的苯甲醛的收率测得的。在恒定量的离子交换钴下添加的碱金属的量对于部分氧化中的催化活性具有最佳值。一氧化碳预还原的碱金属/ Co-NaX和-NaY沸石的O-2吸收量高于无碱对应物。在部分氧化中的催化活性与碱金属/ Co-NaX和-NaY沸石的O-2吸收量相关。在有和没有添加碱金属的情况下，Co-NaY催化剂的漫反射光谱的比较清楚地表明，添加到Co-NaY中的碱金属使离子交换的Co物种的氧亲和力更有效，并且形成了氧化钴（Co3O4）更容易;建议使用氧化钴引起苯甲醇的部分氧化。 [参考：32]

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